.header{
    height: 4.5714rem;
    background: url("/authen/img/header/bg@2x.png") repeat-x -200px;
    text-align: center;
    font-size: 20px;
    color: #fff;
    position: fixed;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: space-around;
    align-items: center;
}
.header .back{
    height: 30px;
    width: 30px;
}
.header .title{
}
.header .share{
}